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Login to database as follows. C: Program Files MySQL bin>mysql -u root -p Enter password. Here is an example which shows how to access TEST database using Servlet. Example of Login form in Servlet Tutorial. Let's see a simple example of login and logout in servlet.

• Php Code For A Login Page

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• Authentication filter and servlet for login 1 answer

I developed a sample login page for validating username and password. If the user gives correct credentials the page will navigate to some other page, else return a message from the servlet to the same login page.

I have enclosed the sample code here:

Php Code For A Login Page

FirstJSP.jsp

And servlet code, Login.java:

It works fine, but while loading the login page it automatically displays Null. Then if the user gives the wrong credentials, it displays the actual message. How do I disable the Null message during run time?

marked as duplicate by BalusC jspJul 29 '17 at 8:09

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3 Answers

Printer not ready. You're comparing the message with the empty string using .

First, your comparison is wrong because the message will be null (and not the empty string).

Second, it's wrong because Objects must be compared with equals() and not with .

Third, it's wrong because you should avoid scriptlets in JSP, and use the JSP EL, the JSTL, and other custom tags instead:

You aren't really using the doGet() method. When you're opening the page, it issues a GET request, not POST.

Try changing doPost() to service() instead.. then you're using the same method to handle GET and POST requests.

..

As I can see, you are comparing the message with the empty string using .

Its very hard to write the full code, but I can tell the flow of code - first, create db class & method inide that which will return the connection.second, create a servelet(ex-login.java) & import that db class onto that servlet.third, create instance of imported db class with the help of new operator & call the connection method of that db class.fourth, creaet prepared statement & execute statement & put this code in try catch block for exception handling.Use if-else condition in the try block to navigate your login page based on success or failure.

I hope, it will help you. If any problem, then please revert.

Nikhil Pahariya

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